Oppresion or Oppression: How To spell?
The word Oppresion is misspelled against Oppression, a noun meaning "A sense of heaviness or obstruction in the body or mind; depression; dullness; lassitude; as, an oppression of spirits; an oppression of the lungs."
Oppression has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings oppre & ion which should not be misspelled with single 'S'
Wrong Spelling:  oppre-s-ion  Correct Spelling:  oppre-ss-ion 
Find more incorrect spellings of Oppression to spell right way.